Question

mrs. rushing fills a balloon with hydrogen gas to demonstrate its ability to burn. which combination to produce the hydrogen she needs?
○ naoh and oil
○ zn and nacl
○ $h_2so_4$ and $caco_3$
○ mg and hcl

Explanation:

• NaOH and oil undergo saponification, producing soap, not hydrogen.
• Zn is less reactive than Na, so it cannot displace H from NaCl to form hydrogen.
• $\text{H}_2\text{SO}_4$ and $\text{CaCO}_3$ react to produce carbon dioxide gas, not hydrogen.
• Magnesium is more reactive than hydrogen, so it displaces H from hydrochloric acid to generate hydrogen gas, following the single displacement reaction of an active metal with a strong acid.

Answer:

Mg and HCl